Impossible Cube

On first glance - if viewing from the correct angle, this cube appears to be impossible. The back edge somehow appears in front of the front edge! Of course, it's simply an illusion that is easily broken by taking a step to the side. However, it remains a cool desk trinket.

Available for viewing on OnShape: https://cad.onshape.com/documents/3d59443dfefd9f8d9633f506